/*light led gpf4*/

.text
.global _start

_start:

/* config gpf4 out */
/* write 0x100 to 0x56000050 */

    ldr r1, =0x56000050
    mov r0, #0x100
    str r0,[r1]

/* set gpf4 state high */
/* write 0 to 0x56000054 */
    ldr r1, =0x56000054
    ldr r0, =0 
    str r0,[r1]
/* also can use mov r0, #0 */

/* while 1 */
halt:
    b halt
